<!-- display flex 实现一个三栏布局，要求左边宽度固定，中间与右边宽度相等 -->

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width initial-scale=1.0">
    <style>
        .container {
            display: flex;
            width: 100vw;
            height: 100vh;
        }

        .left {
            width: 400px;
            background-color: aqua;
        }

        .center {
            flex: 1;
            background-color: beige;
        }

        .right {
            flex: 1;
            background-color: chartreuse;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="left"></div>
        <div class="center"></div>
        <div class="right"></div>
    </div>
</body>

</html>